diff --git a/src/device/usbd_control.c b/src/device/usbd_control.c
index d9eb25195..80648fd75 100644
--- a/src/device/usbd_control.c
+++ b/src/device/usbd_control.c
@@ -51,7 +51,7 @@ typedef struct
 
 static usbd_control_xfer_t _ctrl_xfer;
 
-CFG_TUSB_MEM_SECTION CFG_TUSB_MEM_ALIGN uint8_t _usbd_ctrl_buf[CFG_TUD_ENDPOINT0_SIZE];
+CFG_TUSB_MEM_SECTION CFG_TUSB_MEM_ALIGN static uint8_t _usbd_ctrl_buf[CFG_TUD_ENDPOINT0_SIZE];
 
 
 //--------------------------------------------------------------------+